refactor(examples): group trace examples under examples/system/tracing/

Move 6 trace-related examples (app_trace_basic, app_trace_to_plot,
esp_trace, gcov, sysview_tracing, sysview_tracing_heap_log) from
examples/system/ into a dedicated examples/system/tracing/
subdirectory for better organization.

Update all path references across documentation (en + zh_CN),
build-test-rules, CI configs and component READMEs.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KZAGzon27T12sGbDPPbZ8G

examples/system/.build-test-rules.yml

@@ -1,17 +1,5 @@
 # Documentation: .gitlab/ci/README.md#manifest-file-to-control-the-buildtest-apps
 
-examples/system/app_trace_basic:
-  disable_test:
-    - if: IDF_TARGET == "esp32h21"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1081
-    - if: IDF_TARGET == "esp32h4"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1137
-  depends_components:
-    - esp_trace
-    - app_trace
-
 examples/system/base_mac_address:
   depends_components:
     - *common_components
@@ -68,21 +56,6 @@ examples/system/esp_timer:
     - *common_components
     - esp_timer
 
-examples/system/esp_trace_custom_library:
-  disable:
-    - if: SOC_USB_SERIAL_JTAG_SUPPORTED != 1
-      reason: example transport is USB Serial JTAG
-  disable_test:
-    - if: IDF_TARGET == "esp32h21"
-      temporary: true
-      reason: lack of runners
-    - if: IDF_TARGET == "esp32h4"
-      temporary: true
-      reason: lack of runners
-  depends_components:
-    - esp_trace
-    - freertos
-
 examples/system/eventfd:
   disable:
     - if: SOC_GPTIMER_SUPPORTED != 1 and (IDF_TARGET != "esp32" and (NIGHTLY_RUN != "1" or IDF_TARGET == "linux"))
@@ -116,21 +89,6 @@ examples/system/freertos/real_time_stats:
     - *common_components
     - freertos
 
-examples/system/gcov:
-  disable_test:
-    - if: IDF_TARGET == "esp32h21"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1079
-    - if: IDF_TARGET == "esp32h4"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1138
-    - if: IDF_TARGET == "esp32p4"
-      temporary: true
-      reason: p4 rev3 migration # TODO: IDF-14440
-  depends_components:
-    - esp_trace
-    - app_trace
-
 examples/system/heap_task_tracking:
   disable:
     - if: IDF_TARGET != "esp32c3" and (NIGHTLY_RUN != "1" or IDF_TARGET == "linux")
@@ -299,34 +257,6 @@ examples/system/select:
     - *common_components
     - vfs
 
-examples/system/sysview_tracing:
-  disable:
-    - if: SOC_GPTIMER_SUPPORTED != 1
-  disable_test:
-    - if: IDF_TARGET == "esp32h21"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1082
-    - if: IDF_TARGET == "esp32h4"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1136
-  depends_components:
-    - esp_trace
-    - app_trace
-
-examples/system/sysview_tracing_heap_log:
-  disable:
-    - if: SOC_GPTIMER_SUPPORTED != 1
-  disable_test:
-    - if: IDF_TARGET == "esp32h21"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1082
-    - if: IDF_TARGET == "esp32h4"
-      temporary: true
-      reason: not supported yet #TODO: OCD-1136
-  depends_components:
-    - esp_trace
-    - app_trace
-
 examples/system/task_watchdog:
   disable:
     - if: IDF_TARGET != "esp32" and (NIGHTLY_RUN != "1" or IDF_TARGET == "linux")

examples/system/gcov/main/gcov_example_func.c

@@ -1,8 +0,0 @@
-#include <stdio.h>
-
-
-void blink_dummy_func(void)
-{
-    static int i;
-    printf("blink_dummy_func: Counter = %d\n", i++);
-}

examples/system/tracing/.build-test-rules.yml

@@ -0,0 +1,71 @@
+# Documentation: .gitlab/ci/README.md#manifest-file-to-control-the-buildtest-apps
+
+examples/system/tracing/app_trace_basic:
+  disable_test:
+    - if: IDF_TARGET == "esp32h21"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1081
+    - if: IDF_TARGET == "esp32h4"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1137
+  depends_components:
+    - esp_trace
+    - app_trace
+
+examples/system/tracing/esp_trace_custom_library:
+  disable:
+    - if: SOC_USB_SERIAL_JTAG_SUPPORTED != 1
+      reason: example transport is USB Serial JTAG
+  disable_test:
+    - if: IDF_TARGET == "esp32h21"
+      temporary: true
+      reason: lack of runners
+    - if: IDF_TARGET == "esp32h4"
+      temporary: true
+      reason: lack of runners
+  depends_components:
+    - esp_trace
+    - freertos
+
+examples/system/tracing/gcov:
+  disable_test:
+    - if: IDF_TARGET == "esp32h21"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1079
+    - if: IDF_TARGET == "esp32h4"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1138
+    - if: IDF_TARGET == "esp32p4"
+      temporary: true
+      reason: p4 rev3 migration # TODO: IDF-14440
+  depends_components:
+    - esp_trace
+    - app_trace
+
+examples/system/tracing/sysview_tracing:
+  disable:
+    - if: SOC_GPTIMER_SUPPORTED != 1
+  disable_test:
+    - if: IDF_TARGET == "esp32h21"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1082
+    - if: IDF_TARGET == "esp32h4"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1136
+  depends_components:
+    - esp_trace
+    - app_trace
+
+examples/system/tracing/sysview_tracing_heap_log:
+  disable:
+    - if: SOC_GPTIMER_SUPPORTED != 1
+  disable_test:
+    - if: IDF_TARGET == "esp32h21"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1082
+    - if: IDF_TARGET == "esp32h4"
+      temporary: true
+      reason: not supported yet #TODO: OCD-1136
+  depends_components:
+    - esp_trace
+    - app_trace

examples/system/tracing/app_trace_to_plot/README.md

@@ -23,7 +23,7 @@ This example will assume that an ESP-WROVER-KIT is used.
 
 1. Connect the JTAG interface to the target board. For details about how to set up JTAG interface, please see [JTAG Debugging](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/jtag-debugging/index.html). Power up both the JTAG debugger and target board.
 
-2. To start the tcp socket server, you need to run `read_trace.py` tool under the `esp-idf/examples/system/app_trace_to_plot` path.
+2. To start the tcp socket server, you need to run `read_trace.py` tool under the `esp-idf/examples/system/tracing/app_trace_to_plot` path.
 
 3. After connecting JTAG interface and starting the tcp socket server, you need to [Run OpenOCD](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/jtag-debugging/index.html#run-openocd).
 
@@ -46,7 +46,7 @@ idf.py -p PORT flash monitor
 
 (Replace PORT with the name of the serial port to use.)
 
-**Run Plotting Tool** To plot data and open TCP socket, there is a tool named `read_trace.py` under the `examples/system/app_trace_to_plot` path. Run this tool in the terminal session with configured IDF development environment by entering the command below. This command opens a TCP socket and plots the given data when OpenOCD triggered to start App Trace. If you are running tool at first time, you need to install dash with `pip install dash` in the same terminal session after running configuring IDF development environment.
+**Run Plotting Tool** To plot data and open TCP socket, there is a tool named `read_trace.py` under the `examples/system/tracing/app_trace_to_plot` path. Run this tool in the terminal session with configured IDF development environment by entering the command below. This command opens a TCP socket and plots the given data when OpenOCD triggered to start App Trace. If you are running tool at first time, you need to install dash with `pip install dash` in the same terminal session after running configuring IDF development environment.
 
 ```bash
 python read_trace.py --plot-config data.json --source tcp://localhost:53535 --output-file data.log

examples/system/tracing/app_trace_to_plot/data.json

@@ -1,7 +1,7 @@
 {
   "//data.json": "Apptrace plotting config file for 'read_trace.py'",
   "//Summary and usage": "This file is used for apptrace plotting. You can use this json file with '--plot-config' parameter of the 'read_trace.py' file is to configure graphs for visualizing sensor data",
-  "//More information": "To get more information about apptrace plotting and configuration file, please check 'app_trace_to_plot' example in '../examples/system' and 'read_trace.py' file",
+  "//More information": "To get more information about apptrace plotting and configuration file, please check 'app_trace_to_plot' example in '../examples/system/tracing' and 'read_trace.py' file",
   "Temperature sensors": {
     "data_streams" : {
       "Outside temperature": {
@@ -27,7 +27,7 @@
       }
     },
     "xaxis_title": "Timestamp",
-    "yaxis_title": "Temperature in Celcius"
+    "yaxis_title": "Temperature in Celsius"
   },
   "Altitude sensors": {
     "data_streams" : {

examples/system/tracing/esp_trace_custom_library/README.md

@@ -3,7 +3,7 @@
 
 # ESP Trace External Library Integration Example
 
-This example shows the **minimal** set of files and configuration needed to plug a third-party trace library into the [`esp_trace`](../../../components/esp_trace) component using the public `CONFIG_ESP_TRACE_LIB_EXTERNAL` extension point. It is meant as a copy-paste starting point for vendors and users who want to integrate their own trace recorder (e.g. Percepio TraceRecorder, a custom CTF emitter, a printf-style logger, …) without patching ESP-IDF itself.
+This example shows the **minimal** set of files and configuration needed to plug a third-party trace library into the [`esp_trace`](../../../../components/esp_trace) component using the public `CONFIG_ESP_TRACE_LIB_EXTERNAL` extension point. It is meant as a copy-paste starting point for vendors and users who want to integrate their own trace recorder (e.g. Percepio TraceRecorder, a custom CTF emitter, a printf-style logger, …) without patching ESP-IDF itself.
 
 The example covers:
 
@@ -94,7 +94,7 @@ esp_trace_custom_library/
 
 ### 2. Providing the FreeRTOS trace hooks
 
-`esp_trace`'s public header [`esp_trace_freertos.h`](../../../components/esp_trace/include/esp_trace_freertos.h) is included from `FreeRTOSConfig.h`. When `CONFIG_ESP_TRACE_LIB_EXTERNAL=y` is set, it pulls in **your** `esp_trace_freertos_impl.h`:
+`esp_trace`'s public header [`esp_trace_freertos.h`](../../../../components/esp_trace/include/esp_trace_freertos.h) is included from `FreeRTOSConfig.h`. When `CONFIG_ESP_TRACE_LIB_EXTERNAL=y` is set, it pulls in **your** `esp_trace_freertos_impl.h`:
 
 ```c
 #if CONFIG_ESP_TRACE_LIB_EXTERNAL
@@ -177,7 +177,7 @@ Because the transport is USB-Serial-JTAG and the console is on UART (`CONFIG_ESP
 
 ## Runtime Control — `esp_trace_start` / `_stop` / `_flush`
 
-[`esp_trace.h`](../../../components/esp_trace/include/esp_trace.h) exposes three generic lifecycle calls that dispatch to the active encoder's vtable. The application uses only the public API — it never reaches into the external library:
+[`esp_trace.h`](../../../../components/esp_trace/include/esp_trace.h) exposes three generic lifecycle calls that dispatch to the active encoder's vtable. The application uses only the public API — it never reaches into the external library:
 
 ```c
 esp_trace_start();    // resume emission (also resets the delta baseline)
@@ -194,7 +194,7 @@ In this example the library boots with `s_enabled = false`, so nothing is emitte
 
 ## Other `esp_trace` Helpers
 
-Beyond what this example uses, [`esp_trace.h`](../../../components/esp_trace/include/esp_trace.h) and [`esp_trace_util.h`](../../../components/esp_trace/include/esp_trace_util.h) also expose:
+Beyond what this example uses, [`esp_trace.h`](../../../../components/esp_trace/include/esp_trace.h) and [`esp_trace_util.h`](../../../../components/esp_trace/include/esp_trace_util.h) also expose:
 
 * `esp_trace_is_host_connected()` — gate expensive work when no host is listening.
 * `esp_trace_get_link_type()` — returns `ESP_TRACE_LINK_DEBUG_PROBE`, `_UART`, or `_USB_SERIAL_JTAG`.
@@ -203,5 +203,5 @@ Beyond what this example uses, [`esp_trace.h`](../../../components/esp_trace/inc
 
 ## See Also
 
-* [`components/esp_trace/README.md`](../../../components/esp_trace/README.md) — full architecture overview and adapter API reference.
+* [`components/esp_trace/README.md`](../../../../components/esp_trace/README.md) — full architecture overview and adapter API reference.
 * [`examples/system/sysview_tracing`](../sysview_tracing) — a production-grade integration of SEGGER SystemView built on the same extension points.

examples/system/tracing/gcov/components/sample/some_funcs.c

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
 #include <stdio.h>
 
 

examples/system/tracing/gcov/main/gcov_example_func.c

@@ -0,0 +1,13 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <stdio.h>
+
+
+void blink_dummy_func(void)
+{
+    static int i;
+    printf("blink_dummy_func: Counter = %d\n", i++);
+}

examples/system/tracing/gcov/main/gcov_example_main.c

@@ -1,11 +1,8 @@
-/* Blink Example with covergae info
-
-   This example code is in the Public Domain (or CC0 licensed, at your option.)
-
-   Unless required by applicable law or agreed to in writing, this
-   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-   CONDITIONS OF ANY KIND, either express or implied.
-*/
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
 #include <stdio.h>
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"

examples/system/tracing/sysview_tracing/main/sysview_tracing.c

@@ -1,11 +1,8 @@
-/* Application Trace to Host Example
-
-   This example code is in the Public Domain (or CC0 licensed, at your option.)
-
-   Unless required by applicable law or agreed to in writing, this
-   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-   CONDITIONS OF ANY KIND, either express or implied.
-*/
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
 
 #include "esp_err.h"
 #include "sdkconfig.h"

examples/system/tracing/sysview_tracing_heap_log/main/sysview_heap_log.c

@@ -1,11 +1,8 @@
-/* Application Trace to Host Example
-
-   This example code is in the Public Domain (or CC0 licensed, at your option.)
-
-   Unless required by applicable law or agreed to in writing, this
-   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-   CONDITIONS OF ANY KIND, either express or implied.
-*/
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
 
 #include "sdkconfig.h"
 #include <inttypes.h>